From: Venkatesh Palani (kvpalani@gmail.com)
Date: Thu Dec 22 2005 - 23:21:45 GMT-3
Hi All,
Thanks Scott, I personllay dont use binary rather I use Decimal.
below is the technique
for instance lets take the same example from IE
10.20.30.40
40.30.20.10
to find a access list for these address with overlapping networks I wld
write the aboves address as shown below
[8+2].[16+4].[16+4+2].[32+8]
[32+8].[16+4+2].[16+4].[8+2]
and the common vlaues in two colums shld represent the network address and
the remaining shld fall back as wild cad mask
in this case it will be
8.[16+4].[16+4].[8] = 8.20.20.8
and the wild card mask is the sum of the left overs(the vlaues that were not
used in the network address) in each octects from all the rows(in this case
only two rows)
[32+2].[8+2].[8+2].[32+2] = 34.10.10.34
This shld work for any no of rows , this works better for me rather than
those AND and XOR operations. Any comments are welcome.
Thanx,
Venkatesh
On 12/23/05, Scott Morris <swm@emanon.com> wrote:
>
> From: http://en.wikipedia.org/wiki/Xor
>
> The case of a three, or more, input XOR operation tends to be an
> ill-considered case. An XOR operation with three simultaneous inputs is
> not
> so easily expressed in most popular programming languages. When expressed
> as
> successive binary operations the result is a simple parity, giving a TRUE
> result for any odd number of TRUE inputs.
> three ones XORed simultaneously
>
> When taken as a multi-input black box whose operation follows the formal
> definition and yields the result TRUE when one, and only one, of its
> inputs
> is TRUE, the behaviour is inconsistent with the successive binary mode.
> For
> example; in the case where three inputs are all TRUE (as shown on the
> right,
> in the IEC symbology to emphasise the definition) the result would have to
>
> be FALSE because it does not meet the condition that "only one of its
> inputs
> is TRUE".
> [edit]
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Farrukh Haroon
> Sent: Thursday, December 22, 2005 3:54 PM
> To: Khurana, Sameer
> Cc: Emil Patel; Nawaz, Ajaz; nenad pudar; bmcgahan@internetworkexpert.com;
> ccielab@groupstudy.com
> Subject: Re: Question for Brian McGahan and others
>
> what happened to the definition of XOR I learnt in college....
>
> Odd Number of 1's in input Results in Output of 1, Output = 0
> otherwise...
>
> ??
>
> On 12/22/05, Khurana, Sameer <SKHURANA@amfam.com> wrote:
> >
> > I think you meant by column ;)
> >
> > Concept remains the same if its 4 rows, 5 rows or 10 rows.
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf
> > Of Emil Patel
> > Sent: Thursday, December 22, 2005 11:37 AM
> > To: 'Nawaz, Ajaz'; 'nenad pudar'; bmcgahan@internetworkexpert.com ;
> > ccielab@groupstudy.com
> > Subject: RE: Question for Brian McGahan and others
> >
> >
> > If the row is dissimilar the end result is 1.
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of Nawaz, Ajaz
> > Sent: Thursday, December 22, 2005 11:05 AM
> > To: 'Emil Patel'; 'nenad pudar'; bmcgahan@internetworkexpert.com;
> > ccielab@groupstudy.com
> > Subject: RE: Question for Brian McGahan and others
> >
> > What happens when you increase the #vertical rows and apply various
> > combinations of 1's and 0's.
> >
> > Let's try 5rows?
> >
> > Tia
> > Ajaz Nawaz
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com ] On Behalf
> > Of Emil Patel
> > Sent: 22 December 2005 17:07
> > To: 'nenad pudar'; bmcgahan@internetworkexpert.com;
> > ccielab@groupstudy.com
> > Subject: RE: Question for Brian McGahan and others
> >
> > In XOR , if bit in a column is dissimilar result is 1. You do not add
> > bit row by row.
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of Emil Patel
> > Sent: Thursday, December 22, 2005 10:49 AM
> > To: 'nenad pudar'; bmcgahan@internetworkexpert.com;
> > ccielab@groupstudy.com
> > Subject: RE: Question for Brian McGahan and others
> >
> > 128 64 32 16 8 4 2 1
> >
> > 0 0 0 0 0 0 0 0
> > 0 0 0 0 0 1 0 0
> > 0 0 1 0 0 0 0 0
> > 0 0 1 0 0 1 0 0
> > ___________________________________________
> > 0 0 1 0 0 1 0 0 = 36
> >
> > All vertical bits are checked XOR and if they are:
> > (0+0)=0
> > (0+1)=1
> > (1+1)=0
> > (1+0)=1
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of nenad pudar
> > Sent: Wednesday, December 21, 2005 7:57 PM
> > To: bmcgahan@internetworkexpert.com; ccielab@groupstudy.com
> > Subject: Question for Brian McGahan and others
> >
> > Hi Brian
> > I have the question regarding your paper on Computing Access-List and
> > Wildcard Pairs
> >
> > There you have
> >
> > 00000000
> > 00000100
> > 00100000
> > 00100100
> > _________
> > XOR
> > 00100100=36****
> >
> > I cannot get this trying in any way (for third column)
> >
> > 1) (((0 XOR 0) XOR 1) XOR 1)= ((0 XOR 1) XOR 1)= 1 XOR 1 =0
> >
> > 2) (0 XOR 0) XOR (1 XOR 1) = 0 XOR 0 = 0
> >
> > I am doing something wrong or there is some other trick here ?
> >
> >
> > thanks
> > nenad
> >
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